Dye and process of dyeing.



' .taining about equimolecular Wrap it. ill b DYE AND PRDGESS GEllTff'J-EKNG.

To aid whom may concern:

lie it known that l, demos A, llnauwll-mo, a citizen of the UnitedStates, residing); at otre. Dame, in the county of St. Joseph and Eitateoi Indiana. have invented certain new and useful improvements in Dyesand Processes oi Dyeing, ct which the folio ring is a specification.

it is known that mercuric salts are capahle otreacting with certainaromatic derivatives. particularly phenols and amino bodies, with theproduction oi complex lerivati'i'es containing mercury (Hein ein, 3dedition, Vol. IV, page 1703). i'iccordinp' to the present invention anew dye-bath is prepared hy the interaction of mercuric salts andp-phenylene diamin. My invention comprises also a process whereby the"fabric is dyed simultaneously with the preparation oi the dye-birth.

lihtainple l: tine molecular PTOPULHUH of p-phei rlene diamin dissolvedin water or dilute alcohol is mixed with one n'iolecular proportion of asalt of mercury, preferably mercuric acetate or other readilyhydrolyzably a hi. lily complex derivative of mercitric acetate, Uponstanding the mixture is found to acquire a dark color as the result otsecondarr reactions, the precise nature of which is not now known.Heating the mixture to temperatures above normal, and preferably to theboiling-point, causes the formation of a purple-blacl dye-bath, which iscapable oi? dyeing; sill; and cotton w thout an extraneousmordant. T hisdirect dyeing of cotton may perhaps be eXplained by the mordantiugaction and oxidizing efiect ot the mercuric acetate which is a componentof the dye-bath.

Example H: Instead of boiling the previously mixed solutions of mercuricacetate and pihenylene diamin, these solutions conproportions of therespective compounds, may be heated separately to boiling; and thenmined. in dyeing: cotton for example, the well Washed time may heimmersed in the hot mercuric acetate solution, or boiled therein, andthen transferred to a heated or boilingalcoholic (dilute) p-phenylenedianiin solution, preferably after an intermediate Washing withSpecification of iii-otters Patent.

Application filed December 3, 1917.

The ensuing reaction yields a. cloudyprecipitate, which is prol llattented Dec. Sill,

Serial No. 205,201.

water or dipping in a solution of zinc chlorid or sodium chlorid. Theorder of dipping); is important, the fabric being first immersed in themercuric salt solution, A material excess of acetate, either inpreparation or in dyeing", tends to injure the color,

' hit he s i, l i lcconoru ledCt-lOll resulting in i the formation ofthe new dye-hath is probably ct an oxidizing; character is indicated bythe tact that some metallic mercury may be deposited, with partialdestruction of the dye, in case a considerable excess of mercuric saltused. I

Eiiorts to isolate the new dye have as yet resulted negatively, sinceevaporating the solution even at ordinary temperatures results in thedeposition of an insoluble black compound which is probably. a lake.

T he color on cloth is not immediately attacked by dilute acids, nor toany material degree by dilute alkalis. By the action or strong;hyth'ochloric acid upon dyed silk, the tahric is dissolved, leaving someof the dye in solution.

Example Hi The dyeing processes of Ere amples l and ill mayadvantageously be combinedin case an especially deep color is desired,in the following manner The well washed fabric is boiled first inmercuric acetate. then in an aqueous or dilute alcoholic solution ofp-phenylene (liamin and is finally transferred to a heated or boilingequimolecular mixture of the two compounds. Byythis procedure the colormay be deepened Without subjecting the dyed fabric to the injuriousetlect ot the mercuric acetate solution.

I claim 1. The lierein-described method of preparing: a dye-bath, whichconsists in reacting with a mercuric salt upon a solution of p-phenylenediamin at a temperature above normal.

2. The hereiodescribed method of dyeing fabrics, which consists insubjecting the fabric to the successive action of solutions containingrespectivelv a mercuric salt and p-phenylene diamin.

3. The herein-described method of dyein; fabrics. which consists in sufabric to the successive action 01 solutions containing; respectively amercuric salt and p-phenylene diamin, and then further subjecting' thedyed fabric to a solution co11 products of mercuric acetate andp-phenyraining reaction products of a mercuric salt lene diamin. andp-phenylene dialnin. 6. A dye-bath containing the product of 10 Adye-bath containing" the reactionsecondary decomposition of mercuric de-5 products of a mercuric salt and 'p-phenylene rivatives of p-phenylenediamin.

diamin. In testimony whereof, I aflix my signature. 5. A dye-bathcontainingthe reaction- JULIUS A. NIEUWLAND.

